C Library Functions - sdsdot (3)
NAME
sdsdot(3f) - [BLAS:SINGLE_BLAS_LEVEL1] Compute the inner product of two vectors with extended precision accumulation. SDSDOT := SUM SX * SY (accumulated double precision, returned single)
CONTENTS
Synopsis
Definition
Options
Authors
Further Details
See Also
SYNOPSIS
real function sdsdot(n,sb,sx,incx,sy,incy)
.. Scalar Arguments .. real,intent(in) :: sb integer,intent(in) :: incx,incy,n .. .. Array Arguments .. real,intent(in) :: sx(*),sy(*) ..
DEFINITION
Compute the inner product of two vectors with extended precision accumulation.
Returns S.P. result with dot product accumulated in D.P. SDSDOT = SB + sum for I = 0 to N-1 of SX(LX+I*INCX)*SY(LY+I*INCY), where LX = 1 if INCX .GE. 0, else LX = 1+(1-N)*INCX, and LY is defined in a similar way using INCY.
OPTIONS
N
N is INTEGER number of elements in input vector(s)
SB
SB is REAL single precision scalar to be added to inner product
SX
SX is REAL array, dimension ( 1 + ( N - 1 )*abs( INCX ) ) single precision vector with N elements
INCX
INCX is INTEGER storage spacing between elements of SX
SY
SY is REAL array, dimension ( 1 + ( N - 1 )*abs( INCX ) ) single precision vector with N elements
INCY
INCY is INTEGER storage spacing between elements of SY
AUTHORS
o Lawson, C. L., (JPL), Hanson, R. J., (SNLA), o Kincaid, D. R., (U. of Texas), Krogh, F. T., (JPL) o Univ. of Tennessee o Univ. of California Berkeley o Univ. of Colorado Denver o NAG Ltd. date:November 2017
FURTHER DETAILS
REFERENCES
C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T. Krogh, Basic linear algebra subprograms for Fortran usage, Algorithm No. 539, Transactions on Mathematical Software 5, 3 (September 1979), pp. 308-323.
REVISION HISTORY (YYMMDD)
791001 DATE WRITTEN 890531 Changed all specific intrinsics to generic. (WRB) 890831 Modified array declarations. (WRB) 890831 REVISION DATE from Version 3.2 891214 Prologue converted to Version 4.0 format. (BAB) 920310 Corrected definition of LX in DESCRIPTION. (WRB) 920501 Reformatted the REFERENCES section. (WRB) 070118 Reformat to LAPACK coding style
SEE ALSO
Online html documentation available at http://www.netlib.org/lapack/explore-html/
| Nemo Release 3.1 | sdsdot (3) | February 23, 2025 |
